CODEWITHSUNDEEP
objective-cios
booker
booker

Reputation: 1286

Insert NSManagedObject already instanced Core Data

On apple doc, to insert a NSMananagedObject to Core Data, we need to do this :

- (void)insertObject
{
    NSMananagedObject *newObject = (UserInfo*)[NSEntityDescription insertNewObjectForEntityForName:@"myEntity" inManagedObjectContext:self.managedObjectContext];
    [newObject setValue:@"aName" forKey:@"name"];

    NSError *error = nil;
    if (![context save:&error]) {
    }
}

But if my NSManagedObject is already instanced, how can I do to insert it on Core Data without re-Instancing with 'insertNewObjectForEntityForName:inManagedObjectContext' and copying my attributes ?

I would like something like this :

- (void)insertObject:(NSManagedObject*) newObject
{
    //[newObject insertForEntity:@"entityName" forContext:context];

    NSError *error = nil;
    if (![context save:&error]) {
    }
}

Upvotes: 1

Views: 235

Answers (2)

lnafziger
lnafziger

Reputation: 25740

An NSManagedObject can only be created by inserting it into a context. If you really want to have this in a manager class, you need separate functions to create it and then another one to save it. (Well, you can have one that creates & saves, but then you will have to save it again anyway after you modify it.)

I would suggest something like this in your manager class:

- (UserInfo*)createNewUserInfoObject {
    return (UserInfo*)[NSEntityDescription insertNewObjectForEntityForName:@"myEntity"
                                                                            inManagedObjectContext:self.managedObjectContext];
}

- (BOOL)saveUserInfoObjects {
    NSError *error = nil;
    if (![self.managedObjectContext save:&error]) {
        return NO;
    }
    return YES;
}

Upvotes: 1

Arvin
Arvin

Reputation: 2616

You have to subclass your NSManagedObject and validate. That's what they are for is to add custom validations. No need for you to do any extra work and create a manager.

Here is some code to get you started.

- (BOOL) validateForInsert:(NSError *__autoreleasing*)error {

    /*! @abstract Validation for Inserting Records */

    BOOL bValidity    = [super validateForInsert:error];
    BOOL bUniqueness  = [self validateUniqueness:error];

    return ( bValidity && bUniqueness );
}

Note that the super is called first.

Upvotes: 0

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